ac-ac converters are widely used in industries. These converters are mostly in the form of indirect ac-dc-ac converter with a dc link. The filters associated with this link make the converter bulkier and less reliable. The advent of new power semiconductor switches along with the availability of powerful digital controllers has led to the appearance of new direct ac-ac converters. Direct ac-ac converters, also known as Matrix converters, have many advantages over indirect converters. Despite that, it is difficult to handle the commutation of bidirectional switches in these converters. In this thesis, a new ac-ac converter without a dc link filter is proposed. This converter consists of two converters with standard semiconductor switches, thus eliminating the commutation problems of bidirectional switches. On the other hand, the lack of dc link filter makes the switching pattern of two converters dependable. Therefore, the switching strategy of matrix converters based on dual space vector has been exploited to synthesize the switching pattern of proposed converter. The proposed converter has sinusoidal waveform both at the input and output. Further, the input power factor can be controlled. Simulation results show the operation of proposed converter. Experimental results obtained from a laboratory set-up are in close agreement with the simulation results and show the validity of analysis.
